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Technical guides
Define general, feature-level, geometric, fit, and post-finish requirements without over-tolerancing the part.
Engineering overview
A tolerance defines acceptable variation, but the number alone does not explain the function, datum, manufacturing state, or inspection method. Use general tolerances for non-critical geometry and explicit controls for the interfaces that determine whether the part works. Project-specific achievability must be confirmed from the complete drawing.
Representative visualProcess comparison
This table is a drawing-preparation aid, not a capability promise. The correct control depends on design intent and the applicable drafting standard.
| Requirement type | Use it to communicate | Check before release |
|---|---|---|
| General tolerance | Default limits for dimensions that are not called out individually. | The governing standard, tolerance block, units, and decimal-place rules are explicit. |
| Feature tolerance | The accepted size range of a specific diameter, width, depth, or angle. | The tolerance is tied to function and not duplicated by a conflicting note. |
| Fit | The intended clearance, transition, or interference between mating features. | The mating feature, material state, and assembly condition are known. |
| Geometric control | Form, orientation, location, or runout relative to a datum system. | The datum references are stable, accessible, and functionally relevant. |
| Post-finish dimension | The accepted size or geometry after coating, plating, or another treatment. | The drawing states whether acceptance applies before or after finishing. |
A drawing needs a clear baseline for ordinary dimensions and explicit controls for critical features. Avoid applying the tightest tolerance to every feature by default.
Location and orientation requirements only become meaningful when the drawing establishes how the part is constrained. Build the datum system from functional interfaces where possible.
Technical guides / Manufacturing context
Representative media supports the engineering discussion and does not document a specific customer order.
Achievable variation depends on nominal size, material behavior, wall thickness, feature depth, process sequence, and surface treatment. A value that is reasonable on one feature may not transfer to another.
A requirement should be measurable with an agreed method and datum setup. If a report, sampling plan, or approval step is needed, include it in the RFQ.
Before you request a quote
Use these answers to prepare the requirements for your part. Project details are confirmed during drawing review.
Tolerance capability depends on the feature, nominal size, material, geometry, process sequence, finish, and inspection method. Send the drawing so selected critical features can be reviewed instead of applying a single number to every part.
The drawing should state whether a dimension is accepted before or after finishing and identify masking or buildup concerns. The finish specification and critical interface need to be reviewed together.
It can define a baseline for non-critical dimensions, but it should not replace explicit requirements for fits, critical sizes, geometric relationships, threads, or surfaces that control function.
Not necessarily. Identify the characteristics that determine acceptance and request the needed record scope during quotation. The inspection plan should reflect project risk and the agreed requirements.
Ready for engineering review
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We will provide your quotation within 24 hours after we receive complete drawings and project requirements.
Make the requirements clear
Include quantity, material, finish, critical dimensions, and any inspection requirements.
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